CN110082253A - A method of fuel density is identified according to pressure wave periodic on-line - Google Patents
A method of fuel density is identified according to pressure wave periodic on-line Download PDFInfo
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- CN110082253A CN110082253A CN201910332106.4A CN201910332106A CN110082253A CN 110082253 A CN110082253 A CN 110082253A CN 201910332106 A CN201910332106 A CN 201910332106A CN 110082253 A CN110082253 A CN 110082253A
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- fuel
- pressure
- pressure wave
- density
- oil pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
Abstract
It is a kind of according to pressure wave periodic on-line identify fuel density method belong to internal combustion engine injection field.Diesel fuel injection system is to adjust the opening time of fuel injector nozzle by changing the power-up time of electric-controlled fuel injector, so that the fuel bulk amount of fuel injector spray orifice is flowed through in control.What diesel combustion needed is substantially the quality of oil spout, it is therefore desirable to convert fuel oil quality for fuel bulk amount, fuel density is a key parameter during this.In diesel fuel injection system, the open and close of needle-valve will form the pressure wave in high-pressure oil pipe, when the length of high-pressure oil pipe and injection pressure are definite value, then the period of pressure wave and fuel density are monotonically correlated, therefore can determine fuel density according to pressure wave period.The application proposes to collect the variation of pressure wave during fuel-injected, and propose the method for specifically calculating fuel density according to pressure wave period close to one pressure sensor of the position of fuel injector entrance installation in high-pressure oil pipe.
Description
Technical field
The present invention relates to a kind of novel methods based on fuel injector inlet pressure wave online recognition fuel density, belong to
Internal combustion engine sprays field.
Background technique
Proposed by the present invention is that one kind identifies that diesel fuel system intermediate fuel oil is close based on fuel injector pressure at inlet wave
The method of degree can be applied to the calculating of fuel oil quality.
A kind of pressure wave in attenuation state, this pressure can be generated when fuel system oil spout in the oil pipe of fuel injector entrance
The period of Reeb and fuel density are closely related, so if fuel density will be realized by obtaining the periodic characteristic of this pressure wave
Identification.
In fuel injection processes, the fuel bulk amount for flowing through spray orifice is mainly determined by control power-up time, such as
The volume of fuel oil is converted to the density that more intuitive fuel oil quality just be unable to do without fuel oil by what.Therefore, the density pair of fuel oil
It is of great significance in the fuel oil injection of fuel system.
Summary of the invention
The invention proposes a kind of methods of online recognition fuel density according to fuel injector inlet pressure wave.Based on high pressure
Tubing length, the injection pressure of fuel system, fuel injector inlet pressure wave period, and then obtain fuel density, can be applied to
The calculating of fuel oil quality.
Because the position of inlet pressure transducer installation is close from fuel injector, therefore regards the length of high-pressure oil pipe as pressure wave
Propagation distance.
Test method system of the invention includes: pressure sensor, data acquisition module, for obtaining the injection of fuel injector
The pressure wave periodic characteristic of pressure and entrance；Obtained injection pressure and pressure wave period are substituted into fuel density formula again
It calculates.
Data collecting module collected is measured close to the pressure sensor of fuel injector entrance (at fuel injector 4cm-5cm)
Data, obtain the injection pressure P and pressure wave period t of fuel injection system, and the length L of fuel system mesohigh oil pipe is fixed
Value.Because high-pressure oil pipe length is definite value, according to the relational expression between the fuel density and injection pressure, pressure wave period
Obtain the fuel density of fuel system.
According to the injection pressure of fuel system, high-pressure oil pipe length, the period of fuel injector inlet pressure wave and fuel density
Relational expression find out fuel density, finally acquire oil spout quality.
Invention has the following characteristics that the fuel density that the 1. pressure wave characteristics based on fuel injector entrance obtain, more accurate
Realize will injection fuel bulk amount be converted into intuitive fuel oil quality.2. the method for the present invention can be applied to various diesel engines,
With extensive versatility.
Detailed description of the invention
Fig. 1 fuel oil supply system description of symbols:
1- fuel tank
2- filter
3- low pressure fuel pump
4- high-pressure oil pump
5- rail pressure sensor
6- common rail pipeline
7- pressure limiting valve
8- fuel injector inlet pressure transducer
9- fuel injector
10- electronic control unit
The various other sensors of 11-
Fig. 2 is certain pressure at inlet wave pattern of the fuel injector inlet pressure transducer of data collecting module collected；
Fig. 3 is fuel density calculation flow chart；
Specific embodiment:
The present invention is realized by following steps:
One pressure sensor, fuel delivery as shown in Figure 1 are installed on the high-pressure oil pipe close to fuel injector inlet
It is exactly fuel injector inlet pressure transducer represented by 8 in system.
Pressure signal is acquired using signal acquisition module.
Pressure of the signal acquisition module based on time acquisition fuel injector inlet pressure transducer, as shown in Fig. 2, wherein A, B
Time interval between two o'clock is the period of pressure wave, thus according to signal acquisition module can collect injection pressure P and
Pressure wave period t.
Assuming that the high-pressure oil pipe length from high pressure oil rail to fuel injector is L.
The Period Formula definition of pressure wave are as follows:
In formula, L is the length of high-pressure oil pipe, and unit is m；A is spread speed of the pressure wave in high-pressure oil pipe, the i.e. velocity of sound, list
Position is m/s；T is pressure wave period, and unit is s.
Fuel density with temperature and pressure variation relation are as follows:
λTIt is thermal expansion coefficient, unit is DEG C-1, its value is affected by temperature larger, diesel oil its λ at 20 DEG CTValue is desirable
[(0.9~0.8) × 10-3] DEG C-1, temperature is every to increase by 20 DEG C, λTValue can increase [0.055 × 10-3] DEG C-1, fuel-injected
Temperature T is about 80 DEG C, λTValue is definite value,；ρ0It is initial fuel density, unit is Kg/m3；T is fuel oil injection temperation, single
Position is K；T0It is fuel oil injection temperation, unit is K.
Therefore
Pressure wave spread speed formula in high-pressure oil pipe are as follows:
Wherein, P is fuel-injected pressure, and unit is Pa.
The speed a of pressure wave is brought into available in Period Formula:
By the Period Formula of inlet pressure wave it follows that pressure wave period and injection pressure, the length of high-pressure oil pipe with
And fuel density is related.Wherein, the length and fuel density of pressure wave period and high-pressure oil pipe are positively correlated, with injection pressure at
Inverse ratio.
If fuel density formula is then so acquiring fuel density with pressure wave period are as follows:
High-pressure oil pipe length L (definite value), data acquisition module are obtained into pressure wave period t, injection pressure P substitution above formula,
It can be in the hope of fuel density ρ at that time.
According to the course of injection fuel density acquired, more accurate the fuel bulk amount of injection can be changed into fuel oil
Quality.
Claims (2)
1. a kind of method for identifying fuel density according to pressure wave periodic on-line, it is characterised in that: according to the injection of fuel system
Pressure P, high-pressure oil pipe length L, fuel injector inlet pressure wave period t, obtain fuel density ρ, specific relationship are as follows:
2. a kind of method for identifying fuel density according to pressure wave periodic on-line according to claim 1, it is characterised in that:
Away from a pressure sensor is installed at fuel injector 4cm-5cm on high-pressure oil pipe, entered using signal acquisition module acquisition fuel injector
Mouth pressure wave periodic characteristic.
Priority Applications (1)
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| CN201910332106.4A CN110082253B (en) | 2019-04-24 | 2019-04-24 | Method for identifying fuel density on line according to pressure wave period |
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| CN201910332106.4A CN110082253B (en) | 2019-04-24 | 2019-04-24 | Method for identifying fuel density on line according to pressure wave period |
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| CN110082253A true CN110082253A (en) | 2019-08-02 |
| CN110082253B CN110082253B (en) | 2021-10-01 |
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